Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China
The stability analysis of damaged landslides and unstable debris is important for rescue work and emergency operations. This paper investigates a predisposed geological emergence, inducing the factors and deformation processes of the Zhongbao landslide, which happened on July 25, 2020. The stability...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2021-11-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.774200/full |
| _version_ | 1828975422957682688 |
|---|---|
| author | Chang Zhou Dong Ai Wei Huang Huiyuan Xu Liwen Ma Lichuan Chen Luqi Wang |
| author_facet | Chang Zhou Dong Ai Wei Huang Huiyuan Xu Liwen Ma Lichuan Chen Luqi Wang |
| author_sort | Chang Zhou |
| collection | DOAJ |
| description | The stability analysis of damaged landslides and unstable debris is important for rescue work and emergency operations. This paper investigates a predisposed geological emergence, inducing the factors and deformation processes of the Zhongbao landslide, which happened on July 25, 2020. The stability of the landslide debris was evaluated by an integrated monitoring system consisting of ground-based radar, unmanned aerial vehicles, airborne Lidar, thermal infrared temperature monitoring, GNSS displacement monitoring, deep displacement monitoring, and rainfall monitoring. The strata and weak layer controlled the landslide failure, and topography defined the boundary of the failed rock mass. A continually intensive rainfall caused the deformation and accelerated failure of the landslide. The shallow and steep deposit (Part I) firstly slid at a high velocity, and then pushed the rear part of the landslide (Part II) to deform, forming numerous cracks, which accelerated the rainfall infiltrating into the rock mass. The moisture content increase could decrease the strength of the shale rock within the bedding planes. Finally, with the rock and soil mass sliding along the weak layer, a barrier dam and a barrier lake were formed. The monitoring and numerical simulation results showed that after the landslide failure, there was still local collapse and deformation occurrences which threatened rescue work and barrier lake excavation, and the stability of the accumulation area gradually decreased as the rainfall increased. Therefore, the barrier dam was not excavated until the accumulation rate gradually stabilized on July 28. Moreover, most of the reactivated deposits still accumulated in the transportation and source areas. Thus, in August, the displacement of the landslide debris gradually accelerated in a stepwise manner, and responded strongly to rainfall, especially in the accumulation area, so that it was inferred that the damaged landslide could slide again and cause a more threatening and severe failure. The analysis results of the study area can provide references for the failure mechanism of a rainfall-induced landslide and the stability evaluation of a damaged landslide. |
| first_indexed | 2024-12-14T14:20:48Z |
| format | Article |
| id | doaj.art-70631819c1784befb7c766bed4a047d7 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-14T14:20:48Z |
| publishDate | 2021-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-70631819c1784befb7c766bed4a047d72022-12-21T22:58:05ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-11-01910.3389/feart.2021.774200774200Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, ChinaChang Zhou0Dong Ai1Wei Huang2Huiyuan Xu3Liwen Ma4Lichuan Chen5Luqi Wang6School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, ChinaThe Seventh Geological Brigade of Hubei Geological Bureau, Yichang, ChinaThe Seventh Geological Brigade of Hubei Geological Bureau, Yichang, ChinaThe Seventh Geological Brigade of Hubei Geological Bureau, Yichang, ChinaThe Seventh Geological Brigade of Hubei Geological Bureau, Yichang, ChinaChongqing Engineering Research Center of Automatic for Geological Hazards, Chongqing Institute of Geology and Mineral Resources, Chongqing, ChinaSchool of Civil Engineering, Chongqing University, Chongqing, ChinaThe stability analysis of damaged landslides and unstable debris is important for rescue work and emergency operations. This paper investigates a predisposed geological emergence, inducing the factors and deformation processes of the Zhongbao landslide, which happened on July 25, 2020. The stability of the landslide debris was evaluated by an integrated monitoring system consisting of ground-based radar, unmanned aerial vehicles, airborne Lidar, thermal infrared temperature monitoring, GNSS displacement monitoring, deep displacement monitoring, and rainfall monitoring. The strata and weak layer controlled the landslide failure, and topography defined the boundary of the failed rock mass. A continually intensive rainfall caused the deformation and accelerated failure of the landslide. The shallow and steep deposit (Part I) firstly slid at a high velocity, and then pushed the rear part of the landslide (Part II) to deform, forming numerous cracks, which accelerated the rainfall infiltrating into the rock mass. The moisture content increase could decrease the strength of the shale rock within the bedding planes. Finally, with the rock and soil mass sliding along the weak layer, a barrier dam and a barrier lake were formed. The monitoring and numerical simulation results showed that after the landslide failure, there was still local collapse and deformation occurrences which threatened rescue work and barrier lake excavation, and the stability of the accumulation area gradually decreased as the rainfall increased. Therefore, the barrier dam was not excavated until the accumulation rate gradually stabilized on July 28. Moreover, most of the reactivated deposits still accumulated in the transportation and source areas. Thus, in August, the displacement of the landslide debris gradually accelerated in a stepwise manner, and responded strongly to rainfall, especially in the accumulation area, so that it was inferred that the damaged landslide could slide again and cause a more threatening and severe failure. The analysis results of the study area can provide references for the failure mechanism of a rainfall-induced landslide and the stability evaluation of a damaged landslide.https://www.frontiersin.org/articles/10.3389/feart.2021.774200/fulldamaged landslideemergency monitoringrainfallfailure mechanismthermal infrared temperature |
| spellingShingle | Chang Zhou Dong Ai Wei Huang Huiyuan Xu Liwen Ma Lichuan Chen Luqi Wang Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China Frontiers in Earth Science damaged landslide emergency monitoring rainfall failure mechanism thermal infrared temperature |
| title | Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China |
| title_full | Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China |
| title_fullStr | Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China |
| title_full_unstemmed | Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China |
| title_short | Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China |
| title_sort | emergency survey and stability analysis of a rainfall induced soil rock mixture landslide at chongqing city china |
| topic | damaged landslide emergency monitoring rainfall failure mechanism thermal infrared temperature |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.774200/full |
| work_keys_str_mv | AT changzhou emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT dongai emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT weihuang emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT huiyuanxu emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT liwenma emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT lichuanchen emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina AT luqiwang emergencysurveyandstabilityanalysisofarainfallinducedsoilrockmixturelandslideatchongqingcitychina |